The world's oldest soul food restaurant is also one of its best.

Sit where JFK proposed to Jackie or where Nixon dined on meatloaf at this storied pub.

A super-sized promotional trick that is now a D.C. landmark.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

The walls of the iconic dome are hollow and have a secret stairway.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

The site of the climactic scene from the classic horror film is now a historic landmark.

A restored, one-room African-American schoolhouse in the diva's hometown now preserves the legacy of its most famous student.

This Tennessee museum is dedicated to a tragic railroad hero who inspired the famous ballad that bears his name.

An unknown Hall of Fame in Jackson, Tennessee.

This abandoned nuclear cooling tower casts a shadow over a bucolic town.

This museum pays tribute to the Cherokee leader who created a written language for his people.

Over a dozen Native American earth mounds dating back over 2,000 years dot this Tennessee archaeological park.

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

After it was swallowed by a Georgian mansion, this medieval castle remained forgotten for centuries.

The chaotic studio of one of the 20th century's most important artists has been preserved down to the dust.

A particularly disconcerting tribute to Irish martyrs.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The enchanting archway is the only surviving portal into Dublin's lost medieval wall.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.